Available at Glockstore.com - search item #'s LS005 & T0726.
Comes complete with Guide Rod and Captured Spring already assembled--just drop it into your gun!
Advanced shooters know that to get them most out of their gun, shooting style and ammunition combination they need to test different spring weights for their guide rod assembly. You can actually "tune" the spring to your shooting cadence to allow you to shoot faster and more accurately because the gun action works with you and your ammunition.
These are drop-in, high quality stainless steel guide rods with captured springs in 5 different weights for full-frame Glocks and 4 different weights for medium-frame Glocks.
Please Note:
If you're not handloading your ammunition, or shooting notably light, or hot loads from the factory, it is advised you stay with the factory spring weight for your Glock.
These guide rods will not function in sub-compact Glocks (i.e., Glocks 26, 27, 33, etc.) or any 4th Generation Glocks. Those weapons utilize a dual-spring guide rod system. You can use the Gen4 Recoil Assembly adapter ring that will enable you to use this guide rod in your Gen4 gun.
Source:
https://www.youtube.com/watch?v=5c6xmkp9y7EUploader:
GlockStore